Shank and bit punch



J. DITSON AND A. E. PETERS.

SHANK AND BIT PUNCH.

APPLICATION FILED JAN.6,1921.

1,408,985. at ted Mar- 7, 1922.

2 SHEETSSHEET I.

J. DITSON AND A. E. PETERS.

SHANK AND BIT PUNCH.

APPLICATION FILED JAN. 5. 1921.

1,408,935. Patented Mar. 7, 1922.

2 SHEETSSHEET 2.

UNITED STATES PATENT omen.

JESSE -IDITSON AND ARTHUR E. PETERS, 01? LITTLETON, COLORADO, ASSIGNQR o INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORAT OF NEW JERSEY.

SHANK AND BIT PUNCH.

Specification of Letters Patent.

Patented Mar. 7,1922.

Application filed January 6, 1921. Serial No. 435,476.

ARTHUR E. Pn rnns, residents of Littleton, Q

Arapahoe County, State of Colorado, have invented certain new and useful Improvements in Shank and Bit Punches, of which the following is a specification.

This invention relates to machines for punching hollow articles, but more particularly to a pinning out machine of that type adapted to punch the shanks and bits of the hollow drill steels in order to clear the bore of the steel, especially during the process of sharpening.

The objects of the invention are to produce a compact and rugged apparatus adapted to be mounted on a drill sharpening machine if desired, in rigid alignment with the article to be punched and capable of being manipulated readily and quickly and as often as desired without breakage and without losing its alignment.

' the direction of the arrows,

To these ends the invention is shown in its preferred form in the accompanying drawings, in whichi Figure 1 is a longitudinal sectional elevation of a machine embodying the invention,

Figure 2 is a similar view with the parts in a different position,

Figure 3 is a detail transverse sectional view on the line 3-3 of Figure?1 2 looking in Figure 4 is a side elevation of the machine partly in longitudinal section and shown attached to a drill sharpening machine which is indicated diagrammatically.

Referring to the drawings, and more particularly to Figure 4, a drill sharpening machine is indicated diagrammatically in dot and dash lines having the pedestal A, the stationary fluid pressure cylinder B and the vertically movable plunger C, the movement of the plunger C bein controlled b the operating handle D. K drill steel or other article to be punched is adapted to be clamped between the clamping members F and G and the shank and bit punch H, in this instance, is mounted for longitudinal movement on the guide J to and from the article to be punched. The guide J in this instance comprises a, cylindrical bar or rod held on the stationary part K of the drill sharpening machine as by means of the nut L and braced by means of the strut 0 selcured to the drill sharpening machine as by forward and means of the bolts P and secured to the outer end of the guide J as by means of the nut Between the end of the strut O and guide J a stop R is preferably secured in order to limit the outward movement of the punching machine H.

he punching machine preferably o pnses i umtary g S having a portion T forming a s ide through which the guide J passes, and a hammer cylinder U provided with a reciprocating piston hammer V adapted to impart the impact blows to the punch W for driving it into the article to be punched. A punch guide X is preferably provided mounted on the guide J for guid mg the punch as it enters the article to be punched. This punch guide X also forms a stop against which the article to be punched is placed.

he punching mechanism may be moved back and forth on the guide J in any suitable manner, but I have found that both backward movement may be effected conveniently by hand and in this Instance at Z on the drill sharpening machine and connected to the lug a on the casing of the punching mechanism by means of the link or rod 6 pivoted to the lever Y at the point 0. The connecting rod 6 may be provided with a collar 03 and a cushioning spring e is arranged between said collar and a washer f bearing against the lug a. Another cushioning spring 9 is arranged between the washer k and an adjusting nut j on the screw threaded end is of the connecting rod. By grasping the drill steel E with one hand as the left hand 0 the lever Y may be manipulated by the right hand 1) of the operator to pull the punching mechanism toward the article to be punched and push the punching mechanism outwardly away from the apticlie when the punching operation is comete p Referring more particularly to Figures 1, 2 and 3, the guide J is preferably provided with a longitudinal groove q and the casing is provided with a key or feather 1 suitablysecured thereto by the screws 8 so that as the punching mechanism, is moved forwardly and backward, the key 1' maintains the mechanism in alignment with the article to be punched.

The hammer cylinder U is provided with the anvil block t of any suitable construction a hand operating lever Y is pivoted held in position as by means of the front head i) and the usual side bolts w shown in Figure 4. The punch W is suitably secured to the anvil block as by means of the transverse pin x and the spring clip y having the crossed tongues or finger pieces .2 shown in detail in Figure 3. The spring clip 3 lies in a groove 2 around the periphery of the anvil block and by pressing the finger pieces 2 towards each other the clip may be removed from the anvil block or adjusted as desired in order to remove or adjust the punch W.

The hammer cylinder U is provided with the back head 3 having any suitable oiling device closed by the plug 4 and fluid pres sure is admitted to the punching mechanism through the inlet 5 in the back head, controlled by the valve 6 shown in this instance as a valve of the poppet type, having a stem 7 extending transversely of the back head. The back head 3 is provided with the supply passage 8 and the hammer cylinder is provided with the supply passages 9 and 10. Thehammer piston V is preferably of the differential type having: a head 11 and the shank 12 and in the position of the piston indicated in Figure 1, live air pressure may pass from passage 8 through passage 9 around the shank 12 to the passage 10 and thence behind the main piston head 11 for driving the piston forwardly. An exhaust port 13 is provided for the hammer cylinder and constant pressure is maintained on the differential shoulder 14 of the piston head as this type of piston hammer has been found desirable for apparatus of the type described. Suitable vents 15 and 16 are provided at the front end of the cylinder and in the front head to avoid cushioning of the blow.

The outer end of the guide J is provided with a cam surface 17 in the form of a groove in the guide and a hardened tappet 18 is adapted to move vertically in a socket 19 in a rearward extension 20 of the outer casing U. A locking pin 21 extends into the groove 22 in the tappet to limit its movement. The stem 7 of the poppet valve 6 extends through a removable screw threaded plug 23 forming a valve cage so that the valve as well as the valve cage may be reinto the position indicated in Figure 2, causes the tappet 18 to move out of the groove forming the cam surface 17 and pushes the poppet valve 6 open thus admitting live fluid pressure to the hammer cylinder. The valve 6 is maintained open during the forward and backward movement of the punching mechanism, and automatically closes when the punching mechanism is returned to-its initial position against the stop 1" at the outer end of the guide J.

We claim:

1. In a shank and bit punch, the combination of a guide, a hammer cylinder, movable along said guide, a fluid actuated piston hammer reciprocating in said cylinder, a punch adapted to receive the impact blows of the hammer, a motive fluid controlling valve mounted transversely in the back head of the cylinder, a stop for limiting the outward movement of the cylinder, means on the guide cooperating with the stem of said valve to open and close the valve, and means for bodily moving said cylinder along the guide.

2. In a shank and bit punch, the combination of a guide, a hammer cylinder slidable along said guide, a fluid actuated piston hammer reciprocating in said cylinder, a punch adapted to receive the impact blows of the hammer, a cam surface at the outer end of said guide, a motive fluid controlling valve mounted transversely in the backhead of the hammer cylinder and having a stem adapted to cooperate with said cam surface on the guide, a stop on the guide for limiting the outward movement of the hammer. cylinder,-and means for moving said cylinder along said guide.

3. In a shank and bit punch the combination of a guide, a hammer cylinder slidable along said uide, a fluid actuated piston hammer reciprocating in said cylinder, an anvil block adapted to receive the impact blows of the hammer, a punch suitably attached to said anvil block, a cam surface at the outer end of said guide, a tappet coop-v erating with said cam surface, a motive fluid controlling valve mounted in the back head of the hammer cylinder and having a stem adapted to co-operate with said tappet, a

stop on the guide for limiting the outward movement of the hammer cylinder, and

means for moving said cylinder along said guide.

In testimony whereof we have signed this specification.

JESSE DITSON. ARTHUR E, PETERS. 

